Paper container



H. DRYSDALE.

PAPER CONTAINER.

APPLICATION FILED Nov. 20. i918.

INVE'NWH. H ,Mmmm

ATTRNEY UNITED STATES@ HENRY DRYSDALE, OF LONDON, ENGLAND.

PAPER CONTAINER.

Specification of Letters Patent.

Patented Nov. 22,1921.

Application tiled November 20,A 1918. Serial No. 263,330.

(GRANTED UNDER 'rmi rnovzsro'Ns 0F THE Ac'r 0F MARGH a, 1921, 41 sur. L., 1313.)

To all whom 'it may concern.'

Be itI known that I, HENRY DRYsDALE, a subject of the King of Great Britain, residing at London, England, have invented certain new and useful Improvements in Paper Containers, (for which I have filed applicaemployed to containcoifee or the like.

For this purpose a mandrel is employed i l of the shape in cross section that is required to be given to the container and may, for example, be approximatel rectangular wlth rounded corners, or cylin rical.

Upon this mandrel is wound a continuous strip or sheet of paper ofthe required wldth to form the body -of the box, but so as to overlapor extend beyond the mandrel at one or both ends, where it is turned down in plaits and consolidated to form the bottom or part of the top of the box.

In order that the said invention may be 'more clearly understood and readily carried I into eifect, I will proceed, aided by the accompanying drawings, more fully to describe the same. i

Figure 1 is a perspective vlew illustratlng an approximately rectangular contalner 1n course of formation by winding a sheet of paper upon a mandrel according to the present invention;

Fig. '2 is a similar 'view illustrating the device when the winding'is completed and the bottom is folded into plaits;

Fig. 3 is a diagrammatic end view representing the arrangement ofthe plaiting in a cylindrical container;

Fig. 4 is a sectional view illustrating the partly finished container still upon the mandrel placed in a former, and a die or plunger about to advance to complete the bottom;

Fig. 5 is a sectional view of part of the container showing the bottom in its finished form; and

Fig. 6 is a sectional view of a large sized lcontainer closed in at both ends.

In the several figures like parts are: indicated by similar letters of reference.

to the container b, and may be, for example,

approximately rectangular with rounded corners, or hexagonal, or of other angular figure, or cylindrical, and this mandrel is mounted in any suitable machine and receives the required rotary motion.

Upon the mandrel a is wound a continu.

ous strip 'or sheet of paper o* of the required width to form the body of the container 1),'

but of such awidth as to overlap or extend beyond the mandrel a at one or both ends, according to whether the container b is to be closed at one end, as shown at Figs. 1 to '5, or at both ends, as shown at F'ig. 6, as

hereinafter described.

The paper strip or sheet 6+ is coated with I cement on one side, that is to say, the inside or the side nearest the mandrel a, but a short length of it, to form the rst convolutions of the container o, is left uncoated in order to prevent the cement coming into contact with the mandrel a. v

That part of the paper strip or sheet b* Awhich forms the bottom or top, as the case may` be, of the container b, that is to say, the part b1 which overlaps the mandrel a, is for the first convolution coated on the outside with cement, and for the remainder of the convolutions said voverlapping part b1 is coated on the inside withcement. If desired, the entire end of the sheet forl the firs!` convolution may be coated on the outside; all the overlapping part may be coated on -the outside instead of the inside if desired,

or in addition to theinside coating, depending upon the apparatus employed.

The mandrel a is rotated, and the paper strip or sheet b* is lwound thereon, while a suitable degree of tension is applied thereto in vany well known manner.

During the winding-the overlapping end b1 ofthe container in course of formation is b hand or by any suitable mechanism, ast e winding progresses, folded into triangular plaits b2 which overlap one another and form the bottom of the container, but the paper is preferably scored inthe lines of the folds while in the blank.

At Fig. 2 the triangular plaits are shown to be folded over one another progressively from the sides of the device, while at Fig. 3 said triangular plaits b2 are shown to be folded over one another similarly' in pro-- the bottom is pressed in a'- slidght distancel by means of a d ie or plunger The mandrel a is preferably formed at` its end with a cup or cavity a1, and the die-"f"- or plunger d is formed with a co-acting 'convexity d1 and also with a continuous or annular` notch d2.

lThe pressure of the die or plunger d hasy the effect of consolidating the bottom of the container b (the cupped formation giving added stren th) and forming a continuous or annu ar strengthening rim or ange b3 around the bottom.

At Fig. 6 is.' represented a container b which is assumed to be of large size and is formed with a top as well as a bottom constructed by plaiting and pressing in the manner hereinbefore described.

In thisl case the overlappingv part b1 of the strip or sheet 'of paper b* plaited in the above manner may be insufficient by reason of the width of the paper used to completely close the bottom or top, thus leaving a hole b* which is closed by means of a disk b5 of paper, wood, or the like which is introduced 1nto the inside of the container b beyond the end of the mandrel at the commencement of the winding;A

In order to stiffen the device a disk or plate be of wood or other suitable material, shown by dot and dash lines, may be placed on the bottom within the rim or iange b3 and h eld in place by cement or otherwise; a s mnlar iplate may be used either outside or mside t e base of a container as in Fig. 4 before pressing.

The top end of this large size container is formed in thel winding with a part b1 overlapping the mandrel a similarly to the bottom, and is closed in by plaits b2 in the same way, except that a larger hole or opening b is left whichforms the mouth of the container b, and this is closed by a loose lid 717 of any suitable material seating on they top within the continuous annular rim or fiange b3, or the lid b7 might behinged.

The ends of the device, after plaiting are pressed by means of dies or plungers, as hereinbefore described, the mandrel affording the necessary resistance.

The mandrel employed in the construction of containers closed in at both ends in the manner lastly hereinbefore described is necessarily of a collapsible character, and may be of any known construction having a reduced part or stem for mounting it in the machine and thus affording space for folding in and plaiting the overlapping part b1 of the strip or sheet of paper 5*, and this mandrel, after the container b is finished, is removed through the larger hole or opening bs at the top of the device.

For some purposes lthe container b may be lined with parchment paper or the like- (not shown) which is wound the required number of convolutions upon the mandrel prior to winding thebody'of the container,

and cemented and folded in a similar way.

The finished containers may, when required, be water-proofed by any known method.

Having thus described the'nature andobjects of my invention, what I claim as new and desire to secure by Letters Patent, is

1. A method of constructing a paper container by winding around a mandrel a stri or sheet of paper in layers coated with a hesive on one side, that is, the inside,v with the exception of a short space at the end forming the first layer, and so that there is an overlap of paper beyond the mandrel; progressively plaiting during the wlnding the overlapping part into overlapping plaits to form the end of the device, and compressing the said' plaited part between the two surfaces for the purpose of consolidating same.

2l The method of constructing a pa er container by winding around a mandre a strip or sheet of paper in layers so that there is an overlap of paper beyond the mandrel,

coating the said strlp with adhesive on the inside with the exception of a short length at the end forming the irst layer, and which together with the first layer of the overlapping part is coated on the outside, rogressively plaiting during the winding't e overlappin part into overlapping plalts to form the en of the container, and pressing in the said plaited part by means o a plunger co. operating with the end of the sald mandrel.

3. The method of constructing a aper container by winding around aman rel a strip or sheet of paper in layers so that there is an overlap of paper beyond the mandrel, coating the said strip with adhesive on the inside with the exception of a short length at the end forming the first layer, and which together with the first layer of the overlapping partis coated on thev outside, progressively plaitin during the winding the overlapping part into overlappin plaits to form the end ofthe container, an pressing in the said plaited part by means of a plunger having-a convex end with a no tch all round it coperating with a concave end on the said mandrel.

4. The method of constructing a aper container by Winding around a man rel a strip or sheet of paper in layers so that there is an overlap of paper beyond the mandrel, coating the said strip with adhesive on the vinside Withl the exception' of a short length at the end forming the first layer, and which together with the first layer of Vthe overlapping part is coated on the outside,

progressively plaiting during the Winding the overlapping part into overlapping plaits to form parts of the ends of the container,

pressing in the said plaited part by means of a plunger coperating with a mandrel, completing the closure of the bottomV end by means of a disk or plate cemented in place, and completing the closure of the top end by means of a lid.

5. The method of constructing a paper container wherein a strip or sheet of paper is concurrently laited and overlapped at the end during t e Winding on of the strip or sheet.

In testimony whereof I aiix my signature.

HENRY DRYSDALE. 

